From: Nitin A Kamble <nitin.a.kamble@intel.com>
Date: Sat, 13 Oct 2007 00:40:33 +0000 (-0700)
Subject: KVM: x86 emulator: Implement emulation of instruction: inc & dec
X-Git-Tag: v2.6.25-rc1~1138^2~207
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d77a25074a8f845401f0eb786ebb8996e45d9e22;p=linux-2.6

KVM: x86 emulator: Implement emulation of instruction: inc & dec

Instructions:
	inc r16/r32 (opcode 0x40-0x47)
	dec r16/r32 (opcode 0x48-0x4f)

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
---

diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index 75fd23bade..988c649864 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -96,8 +96,12 @@ static u8 opcode_table[256] = {
 	ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
 	ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
 	0, 0, 0, 0,
-	/* 0x40 - 0x4F */
-	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	/* 0x40 - 0x47 */
+	ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
+	ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
+	/* 0x48 - 0x4F */
+	ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
+	ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
 	/* 0x50 - 0x57 */
 	ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
 	ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
@@ -1376,6 +1380,18 @@ special_insn:
 	if (c->twobyte)
 		goto twobyte_special_insn;
 	switch (c->b) {
+	case 0x40 ... 0x47: /* inc r16/r32 */
+		c->dst.bytes = c->op_bytes;
+		c->dst.ptr = (unsigned long *)&c->regs[c->b & 0x7];
+		c->dst.val = *c->dst.ptr;
+		emulate_1op("inc", c->dst, ctxt->eflags);
+		break;
+	case 0x48 ... 0x4f: /* dec r16/r32 */
+		c->dst.bytes = c->op_bytes;
+		c->dst.ptr = (unsigned long *)&c->regs[c->b & 0x7];
+		c->dst.val = *c->dst.ptr;
+		emulate_1op("dec", c->dst, ctxt->eflags);
+		break;
 	case 0x50 ... 0x57:  /* push reg */
 		if (c->op_bytes == 2)
 			c->src.val = (u16) c->regs[c->b & 0x7];